Online dictionaries and reference sources
Periodic Table of Elements from Chemicool at MIT.
Web Elements another great Periodic Table at the University of Sheffield
Properties of Elements and Compounds from American Elements
NIST Chemistry WebBook chemical and physical property data on over 10,000 compounds.
Encyclopedia Britannica Online has numerous brief articles on chemical elements and topics.
Materials Safety Data Sheets MSDS database at Canadian Centre for Occupational Health and Safety.
Chemistry Hypermedia Project from Virginia Polytechnic Institute
Selected Chemical Data Tables from James Plambeck of the University of Alberta via Intute
PubChem provides information on the biological activities of small molecules
Websites for chemistry and related fields
Chemistry.Org the American Chemical Society's collection of web resources.
Chemistry via Yahoo
World Wide Web Virtual Library: Chemistry hosted by UCLA
Science.Gov portal to authoritative selected science information provided by U.S. Government agencies
Chemical Information and databases from the US National Library of Medicine
ChemDex directory of Internet chemistry sites from the Univeristy of Sheffield